All pages & subpages not appearing as tabs

I've created a Custom Menu with four pages, and one sub-page and two custom links as sub-pages. However, I can't control the way the tabs are displaying: five are displayed (four pages and one sub-page), there are no drop-downs, and the order is random. I've cleared my cache, and tried saving, and refreshing the program, but it stays the same....what's up?